High-Resolution Imaging Method for Time-Diversity MIMO Sonar in Extremely Shallow Water Environments

ZHAI QingYue; LIU Xionghou; YANG Yixin

doi:10.11993/j.issn.2096-3920.2026-0072

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ZHAI QingYue, LIU Xionghou, YANG Yixin. High-Resolution Imaging Method for Time-Diversity MIMO Sonar in Extremely Shallow Water Environments[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0072

Citation:

ZHAI QingYue, LIU Xionghou, YANG Yixin. High-Resolution Imaging Method for Time-Diversity MIMO Sonar in Extremely Shallow Water Environments[J]. Journal of Unmanned Undersea Systems. doi: 10.11993/j.issn.2096-3920.2026-0072

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High-Resolution Imaging Method for Time-Diversity MIMO Sonar in Extremely Shallow Water Environments

doi: 10.11993/j.issn.2096-3920.2026-0072

ZHAI QingYue^{1, 2, 3
,},
LIU Xionghou^{1, 2, 3
,
,},
YANG Yixin^4
,

1.
School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
2.
Shaanxi Key Laboratory of Underwater Information Technology, Xi’an 710072, China
3.
Hanjiang National Laboratory, Wuhan 430061, China
4.
School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China

Received Date: 2026-04-13
Accepted Date: 2026-05-18
Rev Recd Date: 2026-05-14

Available Online: 2026-06-11

Abstract

Abstract

In extremely shallow water environments with strong reverberation, traditional MIMO sonar is affected by cross-correlation interference from synchronous orthogonal waveforms. The high range sidelobes significantly raise the reverberation background, leading to severe performance degradation of adaptive beamforming algorithms. To solve this problem, this paper proposes a high-resolution imaging method for time-diversity MIMO sonar suitable for extremely shallow water environments. The method transmits the same linear frequency modulation signals sequentially through a time-division mechanism, and separates echo signals in the time domain by using pulse repetition intervals, thus eliminating cross-correlation interference. Combined with time-domain truncation and data reconstruction, an equivalent uniform virtual linear array with doubled aperture is constructed, which fully retains the high angular resolution of the MIMO system. Simulation results show that the proposed method effectively suppresses range sidelobes under a strong reverberation background with a signal-to-reverberation ratio as low as −20 dB, and fully exerts the adaptive filtering capability of the MVDR algorithm. Compared with traditional orthogonal MIMO sonar, its half power beam width, side lobe level and integration side lobe rate are significantly optimized, providing a feasible scheme for high-resolution imaging of small targets in extremely shallow water that takes into account both virtual aperture and strong anti-interference ability.
- Extremely shallow water,
- MIMO sonar,
- Time diversity,
- Cross-correlation interference,
- High-resolution imaging

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References(23)

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